In my application I had to call the gf_draw_blit2() very often.

When size of the image is 320x240:
gf_draw_blit2 (context, img_surf, NULL, 0, 0, 319, 239, 0, 0); 
then everything works fine.

When size of the image is 640x480
gf_draw_blit2 (context, img_surf, NULL, 0, 0, 639, 479, 0, 0);
several consecutive lines in the window are black (not rendered at all).

Does mean that hardware is too slow ?
Or maybe I'm doing something wrong ?

I'm testing against the devg-i830.so driver (Device Id: 0x2582).